Nonzero Classical Discord
نویسندگان
چکیده
منابع مشابه
Nonzero Classical Discord.
Quantum discord is the quantitative difference between two alternative expressions for bipartite mutual information, given respectively in terms of two distinct definitions for the conditional entropy. By constructing a stochastic model of shared states, classical discord can be similarly defined, quantifying the presence of some stochasticity in the measurement process. Therefore, discord can ...
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Quantum discord characterizes "nonclassicality" of correlations in quantum mechanics. It has been proposed as the key resource present in certain quantum communication tasks and quantum computational models without containing much entanglement. We obtain a necessary and sufficient condition for the existence of nonzero quantum discord for any dimensional bipartite states. This condition is easi...
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Michele Allegra,1,2,3 Paolo Giorda,1 and Arianna Montorsi4 1Institute for Scientific Interchange (ISI), Villa Gualino, Viale Settimio Severo 65, I-10133 Torino, Italy 2Dipartimento di Fisica Teorica, Università degli Studi di Torino, I-10125 Torino, Italy 3Dipartimento di Fisica del Politecnico, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy 4Dipartimento di Fisica del Politecnico and CNISM...
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We extend the quantum discord to continuous variable systems and evaluate Gaussian quantum discord C(ϱ) for bipartite Gaussian states. In particular, for squeezed-thermal states, we explicitly maximize the extractable information over Gaussian measurements: C(ϱ) is minimized by a generalized measurement rather than a projective one. Almost all squeezed-thermal states have nonzero Gaussian disco...
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What is quantum? As researchers of quantum physics, we are constantly bombarded with attributes like “non-classical” and “super-classical”. We strive to track down the elusive quantum-classical boundary, to understand what makes quantum mechanics so powerful yet counter-intuitive. But to do this, we must first have a firm understanding of the classical world and the laws that classical mechanic...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2015
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.115.030403